13891
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 14400
- Proper Divisor Sum (Aliquot Sum)
- 509
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 13384
- Möbius Function
- 1
- Radical
- 13891
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 45
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers that are the sum of 6 nonzero 8th powers.at n=16A003384
- Composite numbers whose divisors (except 1) all contain the digit 9.at n=22A062680
- Numbers k such that sigma(k) divides sigma(phi(k)).at n=41A066831
- Numbers n such that sigma(phi(n))/sigma(n) = 2.at n=28A067382
- a(n) = 1 + 2 * least i such that A103509(i)=n+1, 0 if no such i exists.at n=33A103510
- n^3 + floor(n^3/2).at n=20A211786
- Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 585", based on the 5-celled von Neumann neighborhood.at n=14A283138
- Numbers whose sum of divisors is equal to the product of the number of divisors of their k first powers, for some k.at n=32A283758
- Number of non-isomorphic multiset partitions of weight n whose incidence matrix has all distinct entries.at n=29A321662
- Numbers that are the sum of seven fourth powers in five or more ways.at n=27A345571
- Numbers that are the sum of seven fourth powers in exactly five ways.at n=26A345827
- Number of partitions of n with rank 3 or higher (the rank of a partition is the largest part minus the number of parts).at n=39A363230
- Integers k for which A000594(k)^2 > 4 k^11, where A000594 is Ramanujan's tau function.at n=31A364087